@article{celeste_bastos_2013,  title={Mid-point for open-ended income category and the effect of
          equivalence scales on the income-health relationship},  volume={47},  ISSN={0034-8910},  url={https://doi.org/10.1590/S0034-8910.2013047004388},  DOI={10.1590/S0034-8910.2013047004388},  journal={Revista de Saúde Pública},  publisher={Faculdade de Saúde Pública da Universidade de São Paulo},  author={Celeste, Roger Keller and Bastos, João Luiz},  year={2013},  month={Dec},  pages={168–174} }